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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cfba8ebd7a084f207fa37d4f59a1380c10db7c84627d67d4172d8bfef0c25fd' 
  AND token = 'F3S+aMlPOFVmXVqsEqoLYTuHHdL/9nRvCZFV0G04VeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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