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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01970c04a78c41024c5508fc9833ce6dc890e857d809188c0cecd17065dd1793' 
  AND token = 'sty1t9doTsBhUA94xy0Sv2r3SLWphoqyLx5dD+VUwRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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