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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd263066e362949b320c68f1de2d7c9c5c1a7bd84bcce5816d0e7a0a1f0a62b60' 
  AND token = 'WugXp1v4wHuj3n3HfJBe7Rlo1YqUcovv6T5Ngm726U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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