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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e2f63170e7e92ee7a9576662e06a3220fac069e09811465bc6895b40534400' 
  AND token = 'GMPE35zXlykaI2ZyomFyJNvPjrw7ExmpLDcM+29VUmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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