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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986e4d9b291fb29f6abafb2d48b610be049820c23cfdc3b435ae33ca2abe2c7f' 
  AND token = 'FPCJaEZ+DKB8Oz08Q/JUree9u28Zi9m34GC8SXmH4qQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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