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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dcb94c7ccbae93476ef1e711d0489be9cec554b3845d3d1bd04b33f03bc76e' 
  AND token = '2Bb7TjMZ8p7KNMwT3S5z+8Qoh/aYG6a3MPx84bV+WcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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