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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f8c70c1543ea8af615f9a8fd9305b0dfcf4c9a2da9afc2b6ca52d5c9a2001b' 
  AND token = 'kBLvKd05gjWjDdjFfvIQfBJ6ET0CRfurP7/4R2AIvhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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