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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663d1063d0e196f37115d2f9444966876f6d4602693c0b1b92e5183f3f2e615b' 
  AND token = 'aqlEDP0b1vyRodeYwZDekNXVStwRglQFFMABe+Iwt8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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