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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ce9e44fac99b370589f0f6ac924870a1a914ae053085e6fcd66bcdf94634a2' 
  AND token = 'sjFBiY79SGh7jE5Aty/NRKJfeTj6DW1D5FqXHrscDSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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