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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975372e229615024fc2edf4cb105c5f861acf662dbb5edb5cff63d87e4932bf1' 
  AND token = 'Axb3oMeLbIzTjTm2jp/UtuNLPCC4yQgOSqbqdwChj0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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