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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477884cf0ab76f14a56dc37fca52f987dd1c6ac06d7ed427ac30404b3df2ef63' 
  AND token = '5a/d/jbq3Eg2c6hbpTke4lrZk9ZLP3Bpf+r7zEEyQM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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