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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43eada9dc247e04d781c17e63c2d9b1a4ce2d1328a05bcc25d435dbf18e19c05' 
  AND token = 'vMRthmDhEQdMoYr1N08oq4CSr1eIEzbbNeANYz/mDAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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