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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994644d199750289531f4c3216fa58e52b6df6dd1222e39c07ed056daf4c0b78' 
  AND token = 'QCTm8f/g9Q5dwvhl7JE5C2hcbCtfqyK/zv4lhLssi5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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