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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1a9c94deed6c4cc12a26b3e16e691424299c99ddcc01be6e97d8ad4e6667d5' 
  AND token = 'NB4x6js0Pp4lNbKCJny+PAhz8Xz1HbhdTjBq+o+JsmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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