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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4fae7e2133b08880bf5112958760cbb3e3c0b7bcd3f9dc4a848701fcd3b43b' 
  AND token = 'eF7ZY6JtVbAxtN3OHSFD/HrZeJRlo4xF7GyS/Di39g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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