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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46011b2e38dea9e7197ca2e38e25622a051f26ba552218798a7f83a71547b4d' 
  AND token = 'uJKtNd//oAweUOGLdwBPgH1Ys5WugI1FQp1IydV66O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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