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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999e5e95815e573259653e52da78948d682a2703b2c16d3e7a0efb45a49594fe' 
  AND token = 'zNcc42BRsQ36yYZ4mpsqBoZTJDwMpLrxNcTsPLEZ6y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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