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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9410535c003d98467a7e42b6dda25e7654db33c9d5363a795a2dd264c8a0f2ed' 
  AND token = 'TQZWDaC0NNT2VPxrryl5yVanY0cJJfuOw6Q2AiOLLf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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