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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f8106e084fc5a2db6b8162d022e5d74fde51edba0f82029e4a30cb90d20446' 
  AND token = 'WHFsM7Qph9gwSqfpb68ehDhx4t2RF81G1l/+Iks8VnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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