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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e677881c2a54ce46ed94bf2e62c1cee4469de04399df28c5a0b67faa143cee03' 
  AND token = '0BDsk2EM4j2kBxPRhkjAM6ZD28OrM2soG9mBLK54utg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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