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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e75044e4ba1dd758a494b32035c081a8dc453110556409358ab2c95c3f4890' 
  AND token = 'z80j4QJYTR8FsEhqM/ITJwk09n6p0lKDOrgwTd6BAmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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