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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403dce72c65e6ef0635dd93388a6428ca22b0d81233af5cf15d6136387520cc9' 
  AND token = 'flTJWhPFIxLiO+lI1Dxzz0gGS+bnQ8EaYJI0X+mSlQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}