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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35d157610de2332c72710dab0dc3a1a30a5332049a6fef6d2d45ba4bada5ea5' 
  AND token = '5nLyLifxM6XnJLcMKy+rKaz2P2RzDOQdLR7NGcwrOFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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