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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee85e57a7d9b4f3411b27bb6d65de0f503f4744539bc4600cfc6645da052525b' 
  AND token = 'Zgho3Yysq4DCXSZUSJEg/7pSCL+A30O5yzXRf+bMoxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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