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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '061000c9c8102b46edddcd0f901f6aecb3f7dedb7e9c1e0dfaf9513a87f6afdc' 
  AND token = 'aQDnUeo+810C/khQu112G22QSLf0u4RBAfle6k+vxes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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