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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eada5991c00a66b92b26d4dd779ee8cc809226300f0f24c45215ab0c16cebacd' 
  AND token = 'ravmWFnuKza9LK1DcS69b90iqlYLvsyEeIgpbf7I0Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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