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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dd60eee26866183144396aa72807cbcf2f28efe6b1bdb43d13b1275949619a' 
  AND token = 'DIh9FYs1iRbcnfrSbr1U6WDgaeJedCflqeAG8nu5KjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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