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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cc9c36b5e2271235238436c5a1ea4c4b824b1b0b935a50730f125c1ed54c4b' 
  AND token = 'U1RYxNO4a20SSRK5CCtomX5AvKsVTdlxS/IR1GrJwtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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