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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f28fa732bc9a97f7b00c12f8e3f0db15d60b33e42d485d11c9cb4b6a45198e' 
  AND token = 'zVXxGnuzvP6lGsJ3EzbuOO85/37yQStWDzcrntmB18U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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