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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb662870653c577ca8c0bf5bf4e6941bbb24e4d5a2bed20a7c406896a0288d82' 
  AND token = 'Y1uCUmZ/1w3uDN9+rsN3i/5trIw1IHfR2l+61ey5hQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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