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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad3300a2d252dc85d15c363c39f58a39694610e0e42f5044d9cff39fad37b7e' 
  AND token = '2aNTpduOLd/3ngclw8boInFV3iv4Hg1YcI+hSVOliQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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