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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc043051b7791cbc6ccc42822209f207a6047d793dab51f85e41d1c73b2ae0be' 
  AND token = 'T/syY5d6fiV72taBIcO37Pa2osfhQn6pieU64SJUlb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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