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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd933cef4811d011a7b271607b39214b2b5a51e87ea95afd95edbddb55c4ba9' 
  AND token = '3gRlmJXL4sNX0mxi8IDNN+/swTDQMuDD1ujoJdRM4lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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