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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7a32c700ce400829b061eed8a2109ec6190a370a2d1686b03c9794aa7b3754' 
  AND token = 'tDLBHUbUVjt1tx0q0BOi3Wbv/7r5XddV95C+n6P7EhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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