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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6476007673b6870e502b6a81c0325be9882bee63c905535c8716e47151c897c' 
  AND token = '8TMMd+3fGUc3Ie1t8BJTbIVw9+V/+YBW0HrgbLUBAhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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