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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7ed2185cecf9d3e88ec766ec3e33fb89b15c0322cdef4c177309f311143006' 
  AND token = '0Bev4pgci6fK8tZl2Jh4XavOdgkhQBQ/AYA68ZL9D3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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