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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeab9aaffe8ac090782bfb8e3933dd32e0ed044bed24f5f61df2f907cb9e2520' 
  AND token = 'E2Rxk/SEQ1/0Hk6FOs6CQN73WJcYfOwIXku/SmkX7h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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