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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95ed9982ac3b02103bf43287eb558896077419d5c2831cd9731c2e5a6dcebdf' 
  AND token = 'A/mybJbecy0rE5ps+DYS4ZnZmrIetAz/esvrvDLbuKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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