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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec8d77abddb39d11575d1aa5071d208c4c0e426970564e722279fa8d56d2877' 
  AND token = '2G52FwjPc4JQC/P1q6gMwbY4H2Zyt+x7kEkeqC6KeaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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