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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4407cb05a4b9907ac3283dbe97bea2c9014e9d4b6c0eb1e8360aeb6cc6773f0' 
  AND token = 'g4pGppfWxuapep21AAKdqZceNh0Nb5Su3MmtvaROyco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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