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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808a87ef9f38101ed21490a54d928ee3a9e3e53c3b7a047057c461afe52dac6a' 
  AND token = 'wJPR3Dyy6p53PkIpV/Eg8tTDros0vyT/haD5//ZdUPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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