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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0659c71920d2998c06e1fe6d0261f852c08f3b05a15bd90b0878a77f8dd14fc0' 
  AND token = 'NeNO9p5f1TJ0703HpshOW8oRM/q/iDQ24jXK03SjWQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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