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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0487be1dae084e99f5ca95f6321c2f4c77d0dc98d254af61c72e4875580033a' 
  AND token = 'ybIL0um29shDkwiBhRND1qVtls4MEjrnItGNteNSJms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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