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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a270d54bb0c4c6091913692f9c8ba22d4114a054a034d1a3c3300910d89b68eb' 
  AND token = '8U9cPqbA5e40u1+M2PzXp/h4Q8AZVkjbbCmyDLsH36M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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