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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab5254c689a2ac51b7356ca31a72f58bd58221bd7a39009505666c758c7ddc1' 
  AND token = 'lnoLaOLA0Z8aOtxilJ5B7hfQ5nDR9VrOwlczarMG95Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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