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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bbbd2647ab4dd85c752b0f82be5e30f33cf45856938caaa4a8a0552190f543' 
  AND token = 'Y59eUu4O2BXrqmLASc1uDiaYWlsf49ipBAIi5eYKu2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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