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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f224e70b1e4c4663c75110f32e3c0a2d7e1ba6b3c2aaba4eca5e1410ceaffba' 
  AND token = 'wrLQYOuaqj/OoXnbw34y9iTy2i3jah6cHj3cX21bB7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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