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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1704b11c220c353a665e6041a60c691a8944a40ab001c5d61870115bbf9be842' 
  AND token = 'ts8w9FNkDFOjCoKqVkOSSALOqNVZcd0WZw6vyM2/DEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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